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    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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    <script>
        //手机
        function Phone(brand, price) {
            this.brand = brand;
            this.price = price;
        }
        Phone.prototype.call = function() {
                console.log('我可以打电话');
            }
            //智能手机
        function SmartPhone(brand, price, color, size) {
            Phone.call(this, brand, price);
            this.color = color;
            this.size = size;
        }
        //设置子级构造函数的原型(这样子级的实例对象就会有父级的方法)
        SmartPhone.prototype = new Phone;
        SmartPhone.prototype.constructor = SmartPhone;
        //声明子类的方法
        SmartPhone.prototype.photo = function() {
            console.log("我可以拍照");
        }
        SmartPhone.prototype.playGame = function() {
            console.log('我可以玩游戏');
        }
        const chuizi = new SmartPhone('锤子', 2499, '黑色 ', '5.5 inch');
        console.log(chuizi);
    </script>
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